#include<stdio.h>
enum months {jan=1, feb, mar, apr, may, jun, jul, aug,
             sep, oct, nov, dec};

void printDays(enum months month)
{
  switch (month) {
    case jan: case mar: case may: case jul:
    case aug: case oct: case dec:
      printf("month %2d has 31 days\n", month);
      break;

    case apr: case jun: case sep: case nov:
      printf("month %2d has 30 days\n", month);
      break;

    case feb:
      printf("month %2d has 28 or 29 days\n", month);
      break;

    default:
      printf("month %2d does not exist!!\n", month);
      break;
  }
}